COMPARISON OF PEAK ICE PRESSURES ON THE IBRV ARAON DURING THE PLANNED AND THE UNUSUAL ICE TRANSITS

摘要

In various ice conditions, icebreakers generally suffer significant ice load on ship's hull. Normal operating conditions are expected from the planned field ice trials and also from general ice transits. Sometimes an icebreaker encounters extraordinary ice conditions during unplanned and/or unusual ice transits. In this paper peak ice pressures recorded from the Korean icebreaking research vessel ARAON, during her normal operation and also during unplanned ice transits are discussed. The IBRV ARAON had sea ice trials in the Antarctic sea ice during 2012 summer season. Strain gauge signals were recorded during her planned icebreaking performance tests and also during the unplanned ice transits in heavy ice conditions. In this paper the effect of ARAON's speed on ice load is investigated by comparing the peak ice pressures on the ARAON's hull during the planned and the unusual ice transits. Unlike the normal operating conditions, the peak pressures on the ship hull are higher in general and do not show any relationship with ship's speed.